Brake



April 25, 1933.

H. F. PARKER BRAKE Filed May 17, 1930 INVENTOR.

HUMPHREY F. PARKER Troma `35 ating cam 14.

Patented Apr. 25, 1933 .HUMPHREY Evenmin., oFsoU'rHfBEivD, INDIANA AssIeNoaiTo BNDZIVXYBRAKEM.

Y comprimi, OFSOUTHBENQ'INDIANA, AooRPoRATIoNor `niLINoIs;`

f applicati@ meditating face area of the friction elements is great.-`

ly increased.

A further object of the invention is to provide 'a brake mechanism in which distribution of pressure applied to the friction elements is more uniformly distributed.

Other objects of the invention will appear from the following description taken in` clonnectionl with the drawing which forms a part L of this specification, and in which:

Figure 1 is a vertical sectional View taken justback of the headof the drum illustrating the friction elements in elevation.

Figure 2 is a sectional view substantially on line 2-2, Figure 1, and

. Figure 3 is a sectional view substantially on line 3-3, Figure 1.

Referring to the drawing for' more spef"fo cie details of the invention, 10 represents a conventional'rotatable drum at the open side of which is a stationary support such as a backing plate 11. Positioned on the back-i ing plate are anchors 12 and 18 and an actu- Positioned for movement on the backing plate is a primary shoe 15, a secondary shoe 16, a second secondary shoe 17 and an auX- iliary shoe 18. The primary and auxiliary shoes are interchangeable. As shown, each of the shoes comprise a rim 19 to which is secured a suitable lining 20 adaptable for engagement with the drum and a web 21 for reinforcing the rim.V The primary shoe has an arm 22, theV secondaryshoe has an arm 23, the second 4secondary shoe has an arm 24 and the auxiliary shoe has an arm 25. These arms are substantially an eXtension of the webs 21 and each project beyond and tangentially to the rim of the shoe.

'shoe`16, the other endof the linkbeing v Voted, as at 28, to lthetoe of the second sec-a 1930. seriai No. 453,382.

As shown, thearm 22 is pivotedtoa link y26. One end oflthis link `-is'piv'oted, as indicated `at 27, to the toe of the first secondaryv` A plvff on'dary shoef17.f'f The arm on the first sec- Aondaryshoe is pivoted onv theanchor'lland the arm"24 ofthesecond secondary shoe isl pivoted on the anchor 12'fand the arm 25 Y 'cho'r 13. .n v The primary and secondary shoes are provided-respectively with should-ers 29 andBO adaptable for engagement `with Vthe operat? `ing cam "ltfandconnectedv between the'pri C65 j "mary and secondary shoes is a coillspringfl` v adapted to l retain* the vshoes in engagement with the operating cam. A spring-32am secured `between a `fixed support 33 andthe link 26. vThe `springs 3.1and 82 serveas rel70' turn' springs 4and Ito retain the friction vinembers in proper; spaced relation to the *drum whenthebra'ke is inanofl'. position.v f

" `Upon actuation of -the cam 14, the friction elementsare vcaused to spread apart and` to engage'thet'oe Ofthe primary shoe withtthe drum. This causes'a slight rotation of the friction elements-tand laisl'ightfarcuatefmovei ment thereof. This 4"movement "transmits force throughthe arm 22to thelink 26"and"`80 through .this `link to the toes ofthe firstland v second secondary "shoes" These shoes i -are pivoted on the'anfchors 12 and V13 respectively, hence they are caused to engagethe'drum@` f uniformly with an equal distributionfof pres- 85 sure between the friction elements. 'Byreasony of this structure,`a larger surface area of thef'riction members isprovided for engagement with the radius of .the `drum and hence more eficient braking action may be attained.

Although this inventionhas been described in connection with certain specicembodiments, the principlesl involved are susceptible ofnumerous other 4applications thatwill';:95

readily occur to persons skilled ingthe'art. The invent-ion is, therefore, to b'e `limited only `-as indicated -by the scope ofthe' ap- -pended claims. L

Having thusdescribed the various features e theinvention, whatI claim as new andidesire to secure by LettersPatent'is 1."A kbrake comprislng atram of friction i yelements each having ka heel anda toe, two rofthe elements *being anchored at their heels Yand means operated' by another element for applying force tof the toesofthe anchored A elements, and another friction elem-ventA effec-'1 rvtiveinreverse braking and actuated'simul# taneously with said thirdv element.

Y elements, anchors forat least two of the elefpotherjfrictionl,element `effective in reverse braking and actuated-1V ysimultaneously with ,v said'third element. l A

'2. A br' ke comprising a'series of frictionl ments, an Vactuating element Vand means con# Y Y nectin'g'theactuatin Velement to apply force i,

to the toes of the anc ored elements, and ani 32A brake comprising aseriesfof l, k v, y.,elements,ieachprovided with agheelandatoe,`V` 1 l' atleast two ofthe elements beinganchored Y g at theirheels and means connected to the heel verse 'braking and actuated simultaneously with said third element. Y t Y j 4.A1brake comprising a. plurality'of friction `elementseach having-a heel and a toe, Y. A arms extendingif'rom the heelsofthe respeci ytive elements,th'e arms oIl` at leastV two of thei ,A :elements being anchored',alinkpivotally'com` {of anotherrfricti'onl element for applying .forcerto Y the i toes ofi-'the F anchored elements, Y and another'friction elementI effective in renecting lthe toes offatleasttwo of the elements' and one of the elementshavingthe arm on its heel pivotally connected to the link. y

*355A brake comprising a' support, afdrum associatedy therewith, Va plurality of friction 'Y elements movably positioned onvthe supportvv drum, atleast two of the frictionelements anchoredon the support, `at least two ofthe Y kffrictionv elements having their free ends con- 1 AV."n'ected byalinkand onefof the elements pivotallycon'nected' tothe link. Y

. 6. A fbrake comprising a Y' tion elements having a heeland V.a toe and an l QU arm` extending from Y* the respective heels v thereof, the arms onat'least two; of thelfricv tion elements being anchored, a link pivotal- Y Y y ly connecting: thev toes of at least twoof the y Yelements'and the heel of one of the elements Y pivotally connected substantially centrally ofthe links and means between two of theele- VVments for spreading the elementsin engagefmentwith the drum.

f7.' A brake comprising-'a fixed support, a

Vdrum associated therewith, a" plurality of and adaptable for cot-operation l with the y e fixed support, a'

rotatable drumzassociated therewith, aY plu- Vrality, of frictionV elementsaposition'ed for AmovementA on the support, eachiof thefriclink connecting the anchored Afriction elements, and a friction elementV pivotally connected to the link.

8. A brake comprisingy at least three frici tion elements Yarranged iny series, anchors for the ,v similar rends of two of the friction elements, and means forYanchoringl thevthirdv friction element to the anchoredv-friction'elej y, g ments. Y :.1 *Y Y' ff "9L A brake 'comprising-three'-V frictionfel'e ments' arranged in; series,v anchors for the` Y ,last two elements in the series andV ymeans actuated by the first element in the series for,l

tensile application y.of ther-second element in the series and compressive: application of the last-elementi inf-the series.;AV .1

In, )testimony k.wlfiereof, [I`

friction elements; in series on [the 'support v adaptable for cooperation ,withA the drum,

ati lleastztwo ofthe friction. elements an-V- Y' choredon the support at likeends with re- 5 Y 1, .165

spectvto the direction ofdrum movement, a 

